摘要
采用真空熔炼炉制备了两种不同V含量的微合金化铸钢,并对其进行了正火+淬火+不同温度回火处理,研究了回火温度对试验钢组织及性能的影响。结果表明,V含量的增加促进了碳氮化物的析出,降低了C、N在马氏体中的固溶度,使铸钢的冲击吸收能量有所提高。当回火温度低于400℃时,强化机制以固溶强化为主,当回火温度高于400℃时,强化机制以析出强化为主。V含量的增加还促进了碳氮化物在高温回火时由短杆状向球状的转变,从而有效改善了高温回火脆性。
Two microalloyed cast steels with different V contents were prepared in a vacuum melting furnace and heat treated by normalizing, quenching and tempering at different temperatures. Effect of tempering temperature on microstructure and properties of the two tested steels with different V contents was studied. The results show that the effect of V content promotes the carbonitride precipitates and reduces the solid solubility of C and N elements in the martensite, resulting in the improvement of impact absorbed energy. When tempering temperature is below 400 ℃, the dominant strengthening mechanism is solution strengthening. When tempering temperature is above 400 ℃, the dominant strengthening mechanism is precipitation hardening. The increase of V content also promotes the carbonitride precipitates shape translating from short rod to granular, and the brittleness of high temperature tempering is improved.
作者
王晓东
陈蕴博
左玲立
毛丰
张程
陈冲
王舒
崔海林
Wang Xiaodong;Chen Yunbo;Zuo Lingli;Mao Feng;Zhang Cheng;Chen Chong;Wang Shu;Cui Halin(China Academy of Machinery Science and Technology Group Co.,Ltd.,Beijing 100083,China;National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials,Henan University of Science and Technology,Luoyang Henan 471000,China;Science and Technology on Transient Impact Laboratory,Beijing 102202,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2022年第10期19-24,共6页
Heat Treatment of Metals
基金
国家重点研发计划(2020YFB2008400)
河南省重点研发与推广专项(222102230059)
瞬态冲击技术重点实验室基金资目(6142606211110)。
关键词
微合金化
回火
硬度
冲击吸收能量
microalloying
tempering
hardness
impact absorbed energy
